Influence of rice straw-derived dissolved organic matter on lactic acid fermentation by Rhizopus oryzae

Xingxuan CHEN, Xiahui WANG, Yiyun XUE, Tian Ao ZHANG, Yuhao LI, Jiajun HU, Yiu Fai TSANG, Hongsheng ZHANG, Min Tian GAO

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Abstract

Rice straw can be used as carbon sources for lactic acid fermentation. However, only a small amount of lactic acid is produced even though Rhizopus oryzae can consume glucose in rice straw-derived hydrolysates. This study correlated the inhibitory effect of rice straw with rice straw-derived dissolved organic matter (DOM). Lactic acid fermentations with and without DOM were conducted to investigate the effect of DOM on lactic acid fermentation by R. oryzae. Fermentation using control medium with DOM showed a similar trend to fermentation with rice straw-derived hydrolysates, showing that DOM contained the major inhibitor of rice straw. DOM assay indicated that it mainly consisted of polyphenols and polysaccharides. The addition of polyphenols and polysaccharides derived from rice straw confirmed that lactic acid fermentation was promoted by polysaccharides and significantly inhibited by polyphenols. The removal of polyphenols also improved lactic acid production. However, the loss of polysaccharides during the removal of polyphenols resulted in low glucose consumption. This study is the first to investigate the effects of rice straw-derived DOM on lactic acid fermentation by R. oryzae. The results may provide a theoretical basis for identifying inhibitors and promoters associated with lactic acid fermentation and for establishing suitable pretreatment methods. Copyright © 2018 The Society for Biotechnology, Japan. All rights reserved.
Original languageEnglish
Pages (from-to)703-709
JournalJournal of Bioscience and Bioengineering
Volume125
Issue number6
Early online dateFeb 2018
DOIs
Publication statusPublished - Jun 2018

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Citation

Chen, X., Wang, X., Xue, Y., Zhang, T.-A., Li, Y., Hu, J., . . . Gao, M.-T. (2018). Influence of rice straw-derived dissolved organic matter on lactic acid fermentation by Rhizopus oryzae. Journal of Bioscience and Bioengineering, 125(6), 703-709. doi: 10.1016/j.jbiosc.2018.01.004

Keywords

  • Lactic acid fermentation
  • Rhizopus oryzae
  • Polyphenols
  • Polysaccharides
  • Rice straw